<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
    <h1>注册页面</h1>
    <input type="text" placeholder="请输入用户名" @blur="f()" v-model="user.username">{{info}}<br>
    <input type="text" placeholder="请输入密码" v-model="user.password"><br>
    <input type="text" placeholder="请输入昵称" v-model="user.nickname"><br>
    <input type="button" value="注册" @click="reg()">
</div>
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
<script>
    let v = new Vue({
        el:"body>div",
        data:{
            user:{
                username:"",
                password:"",
                nickname:""
            },
            info:""
        },
        methods:{
            reg(){

            },
            f(){
                axios.get("/check?username="+v.user.username)
                    .then(function (response) {
                        v.info = response.data;
                    })
                console.log("用户名:"+v.user.username);
            }
        }
    })
</script>
</body>
</html>